error in screen scraping

[sqlProg]

I am using Host Integration Server 2006 to do
some screen scraping of an old mainframe application. I am seeing a number of errors that read:
"The 3270 session is busy. The Receive () method should be called to
determine when input is allowed and this method can be retried."

Below is my code
sd.SendKey(SessionDisplayKeys.Clear);
sd.WaitForSession(SessionDisplayWaitType.Active, 10000 ); // I get the error right here

Can anyone tell me any workaround for this.

I dont know how to proceed from here

Any help will be greatly apprecaited.